For example, Generation I is about genetics. The starters are all based on reptiles and/or dinosaurs (Bulbasaur is also a Dinosaur/Plant hybrid), Mew and Mewtwo is reflecting cloning (while Mew itself has the DNA of all Pokémon), Eevee representing DNA modification, and the fossils/extincting Pokémon are resurrected by scientific experiments. Generation II is about folklore and mythology.